Universal automatic slide rest



Dec. 29-, 1936. F. c. BLANCHARD V UNIVERSAL AUTOMATIC SLIDE REST Filed Dec. 20, 1935 'Y'Sheets-Sheet 1 62 88 Invenior:

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1936- F. c. BLANCHARD UNIVERSAL AUTOMATIC SLIDE REST Filed Dec. 20, 1935 7 Sheets-Sheet 7 Irv/verifier: fiederw'czv 613501107107 0! Z3 fl b M1 cflii 'ya Patented Dec. 29, 1936 UNITED STATES UNIVERSAL AUTOMATIC SLIDE REST Frederick C. Blanchard, Brookline, Mass, as-

signor to Rivett Lathe and Grinder, Inc., Brighton, Boston, Mass, a corporation of Massachusetts Application December 20, 1935, Serial No. 55,452

24 Claims.

This invention relates to a universal, automatic slide rest for lathes, and will be understood by reference to the following description when taken in connection with the accompanying drawings of one specific embodiment thereof, while its scope will be pointed out more particularly in the appended claims.

In the drawings:

Fig. l is a plan of a portion of a lathe equipped with a universal, automatic slide rest embodying the invention, with the top side obliquely disposed for taper turning;

Fig. 2 is a side elevation of the slide rest as viewed from the right hand side of Fig. l, but

a with the top slide swung parallel with the axis of rotation of the work, as it would be in cylindrical turning, and in this view the lathe bed and the clamping knob or nut are shown in section in a vertical plane;

Fig. 3 is a vertical, sectional view on line 3 3 of Fig. 2 illustrating the change-gear mechanism;

Fig. 4 is a sectional view on line 4-4 of Fig. 3; Fig. 5 is a sectional .view on line 55 of Fig. 3;

Fig. 6 is a horizontal, sectional view on line 6-6 of Fig. 2;

Fig. 7 is a vertical, sectional view on line l-'i of Fig. 6, illustrating the clamping of the tool bit in the tool holder;

Fig. 8 is a vertical, sectional view on line 8--8 of Fig. 6, illustrating the tool holder rock-shaft, the rack dog and associated parts;

Fig. 9 is a vertical, sectional view on line 99 of Fig. l;

a Fig. 10 is a vertical, sectional view on line Fig. 11 is a vertical, sectional view on line Il-ll of Fig. 10;

Fig. 12 is a horizontal, sectional view on line l2-l2 of Fig.11;

Fig. 13 is a horizontal, sectional view on line l3|3 of Fig. 11; and

Fig. 14 is an elevation of the tool holder, tool bit, and. associated parts as viewed from the left hand side of Fig. 6.

' Referring to the drawings and to the embodiment of the invention illustrated therein by way of example, and having reference at first to Fig. 1, there is shown a portion of a lathe having a bed 20, a head stock. 22, a spindle nose 24, and a collet 26 in which is a work piece 28 coaxial with the spindle. The lathe bed is provided with a longitudinal slot 30 which, as shown in Fig. 2, receives a bolt 32 threaded at its lower end to receive a knob 34 resting against a washer 36 against the bottom of the lathe bed. The bolt extends upwardly, loosely through an opening 33 (see Fig. 9) in a slide rest shoe 4% which rests upon the lathe bed 20, and which, in turn, supports a base 42 provided witha longitudinal T slot id to receive a T head 46 formed on the upper end of the bolt. Thus, by loosening the knob 3t,'the slide rest shoe 40 may be adjusted longitudinally of the lathe bed, and. the base 42 may be adjusted transversely of the bed.

The base 42, in turn, supports a bottom slide 8 comprising an upper half 50 and a lower half 52, the latter being mounted to slide longitudinally upon and guided by the base 42, as by a dovetail guide 54 projecting upwardly from the base into a dovetail groove 56 in the lower half 52 of the bottom slide 48, there being a gib 58 between one side of the guide and one side of the groove. Longitudinal adjustment of the bottom slide (i. e. transversely of the lathe bed) is eifected by a feed screw 60 which, as shown in Fig. 9, has threaded engagement with a feed nut 62 suitably secured, as by a screw 64, to the bottom slide 48.

The feed screw, near itsfront end, is mounted in a bearing plate 66, and at its rear end in a sleeve 68, and it is held against longitudinal movement by an enlargement or collar '70 near its front end, and by an enlargement or flange 12 on the rear end of the sleeve 68 and resting against the rear face of the base 42. Relative rotationof the screw'fifl and the sleeve 68 is prevented by a key M in a key way 16, and end play is taken up by an adjusting screw 18 threaded into the rear end of the feed screw and having a head 80 resting against the rear end of the sleeve 68.

Secured to the front end of the feed screw is a ball handle 86 (see Fig. 2) to which is secured a handle 82 constituting a crank, by means of which the feed screw may be rotated. The extent of rotation is indicated by 'an indicator dial 84 afiixed to the feed screw and cooperating with 'an indicator flange 86 afiixed to the bearing plate 56. A binder screw 88 threaded axially into the front end of the feed screw binds the dial 8 3. To clamp the bottom slide 48 securely'to the base 42, I have provided two binders, herein screws 90, provided with handles 92 (see Fig. 2) threaded into the lower half 52 of the bottom slide 43 and acting on the gib 53 (see Fig. 10). 'The upper and lower halves 5D and 52 of the bottom slide 48 are conveniently secured together by screws 94 (see Fig. 9).

The bottom slide 48 supports a lower swivel 96 suitably mounted thereon for adjustment about a. vertical axis 'AA. To this end, a cone 98 is suitably secured as by screws mo and dowel pins 62 to the bottom of the swivel 96, and its conical surface turns in a corresponding conical surface H34 at the upper part of a chamber ma formed partly within each of the upper and lower halves 5i) and 52 of the bottom slide Qt. This cone is provided with an upwardly directed cylindrical part H38 which turns in a corre- 'indrical piece extendingthrough a-correspond binder, herein a screw II6 threaded through the side of the upper half 52 of the bottom slide 48 and provided at its outer end with a handle 8., To indicate the angularrrelationshipl be tween the swivel 96 and the bottomslide 48,

the swivel is provided with a cylindrical proj'ec-' tion I about which is a graduated ring I22 I secured as by screws I24 to theupper surface against the tool holder I40and is held against' of the bottom'slide, and provided witha set of graduations I26, in degrees, cooperating with an index mark I28 onan exposed'porti'on of the cylindrical projection-I20. V The swivel 96, inrturrnsupports 'a hollow, boxlike top slide I30 which, as shown in Fig. 9, is provided at its top'with a cover 'I3I, and is guided at its bottom by a dovetail guide I32 projecting upwardly into a dovetail groove I34, in the top slide,'there-being a gib I36 between one side of the guideand one side of the'groove, and held in place by screws I38. Thus, the top slide is mounted to slide longitudinally upon the swivel 96. The top slide carries at one end a tool holder I40 (best shownin'Fig. 6) having at one end a handle I42 and at its other end a tool bit I44 whose cutting edge I46, during the cutting operation, is in a horizontal plane containing the axis ofrotation of thework piece 28 and the lathe spindle. i I

The tool bit is suitably mounted on the tool holder asby a toiol'bitfshank I'41 which is a cylingly shaped opening I48 inthe toolholder. The tool bit extends through a slot I50 in the tool bit shank and rests against a roughened face I52 of=a washer I54whose opposite face rests rotation by the dowel pins I56 passing through by dowel pins I60 "and having a"si'milar1y roughene'd 'face I62, is engaged bya similarly roughened face of a collar I64. A cap screw I66, whose head engagesthe outer face of the collar I64; is threaded axially. into the tool bit shank I41 and, by, drawing the tool bit I44 against ,the washer I54, clamps the tool bit firmly to the toolholder I40.

The tool holder is fixedly secured to one end of a tool holder rockshaft' I 68(see Figs. '7 and 8) as byproviding' the-latter 'with'a shoulder I10 and a reduced'portion I12, the latter beingriveted at the outerend, as at I14. A set screw 7 l16, threaded into the, tool holder and engaging the reduced portion I12, further secures the tool holder to the rockshaft. The top slide I30 is hollow and box-like and presents bearings I18 and I in which the 'rockshaft is mounted;

'shaft, restingat one end'adjacent the *bearing I18, and at its other end against an adjusting 'collar I84 which is threaded onto the rockshaft and adjusts-the strength of the spring.

While the turning is being done, the tool holder I40 is locked to the top slideand is prevented from rockingabout'the axis of the rocka shaft I68 by a locking pin I86 whose forward end is-then-received in a hardened bushing I88 in the tool holder. The'locking pin is, mounted A simi- V to slide longitudinally in bearings I90 and IE2 presented by the top slide I30 and, it is urged into interlocking engagement with the tool holder by a compression spring I94, one end of which rests against'the bearing I92 and the other against a shoulder I 95 presented by a sleeve I96 which is secured to the locking pin by a set screw I91. Movement of the locking pin, under remains in interlocking engagement with the tool holder until, at a predetermined point in the advance of the slide, the locking pin is pre- 7 vented from advancing further by meansy now to bedescribed, which causes the'locking pin to be withdrawn from itslinterlocking engagement with the tool holderl Secured to the 'rear end of the swivel 96 is an end'plate 202 through which the locking pin I86 passes loosely. The

'nism presently to be described, the locking pin locking pin is threaded to receive a knurled-stop nut 204 which, by rotation on the pin, maybe adjusted lengthwise of the pin, and'its' adjustment is maintained by a knurled'l'ock nut 206 h also threaded onto the locking pin. 1 The point at which the locking pin'will-start to-withdraw from the bushing I88 is determined-by adjustment of the stopnutj 204 lengthwise'of the looking pin. When'thei locking pin is entirely'withdrawn'from the bushing, the tool holder, carrying thetool bit, 'will-rock'downwardly about the axis of the rockshaft I68 unde'r 'the influence of springs presently to be described. l

V A rack V 208, maintained against lengthwise 'movement with relation to thef top slide I30 by two plugs 2I0, one. at each Lend-- threaded into the ends of. the" top slide, is.

adapted to mesh--with a pinion 2I2' securely extends through a slot 2l6iextending lengthwise in the bottom 'of the topslide- I30. During the' advance of the" top slide and during :the time when the tool holder is locked by the lookthe pinio'n 2l2 by a rack-dog..2l8,vsecured to the rockshaft asby set screws 220g(see Fi'g. 6),-a'nd having a hardened .strip 222 :(see Fig; 13),.se-

cured thereto as by, screws 224, and-engaging .a

face 226 on the hacker the rack. 1

" The rack 208 is carried by rods 228 to' which it is secured as by threading therrodsi intoi'the rack at 230, and these rods,'at theireother ends, slide in and are guided by plugs 232 whichare' threaded into the top slide-; Compression springs 234 disposed about the? rods 228 I rest the rods 228. 1 The springs are maintained under stress whichtends to urge the rack'208 out oi mesh with pinion 2I2, and theywill move it out of mesh, and the rack, acting through the dog V ,co 1 against the plugs 232 and againstgcollars 236' which are suitably secured -Vasby pins 238 to- 2I8, will rock the shaft I68, and thus lower the l tool bit I467when the locking pin I86 is withdrawn from its interlocking engagement'with the tool'carrier I40. ,The movement of the dog 2I8 under the influence of the two springs 234" is limited by a stop plug 239 (see Fig.9)

threaded into the side of the top slide; I30.

When this happens, the top slide 130 will, be re-- tracted, by a tension, retracting or returning The top slide I30,'and the toolrholderil 40 and y the tool bit I44, are advanced by mechanism now to be described, referencebeing had; at first, to Fig. 13.

spring 240 (see Fig. 10), whose ends are hooked onto studs 242, one threaded into the front end of the top slide I30, and the other into the end plate 202 of the swivel 96. The returnmovement of the top slide under the influence of the spring is limited by a stop, herein a cushion disk 243 (see Fig. 6) mounted in a socket 244 secured to the front end of a stop screw 245 which is threaded into the end plate 202 for lengthwise adjustment and is provided at its rear end with a knurled head 246 (see Fig. 1) to facilitate turning the same with the fingers. A knurled lock-nut 241 threaded onto the screw and resting against the end plate 262 maintains the adjustment. I

Returning now to the mechanism which advances the top slide, and referring to Fig. 10,

the shaft 2I4 which carries the pinion 2I2 extends downwardly through a bearing 248 presented by the swivel 96, and it is coaxial with the vertical axis about which the latter is adjustable. The lower end of the shaft is received in 'a second bearing 25D presented by the lower half 52 of the bottom slide 48. Above this bearing, and within the chamber I06, there is a worm gear 252 which is suitably secured, as by a pin 254, to the shaft 2I4, and this worm gear meshes with and is driven by a worm 256.

Referring now to Figs 11 and 12, the worm 256 is secured as by a pin 258 to a Worm shaft 260 which extends lengthwise within a chamber 262 formed partly within each of the upper and lower halves 50 and 52 of the bottom slide 48. The shaft is mounted in two bearings 264 inserted in holes 266 presented by the upper and lower halves of the top slide and is maintained against lengthwise displacement by sleeves 268 interposed between the bearings 264 and the ends of the worm 256. The rear end of the shaft 260 turns in an additional bearing 210 presented by the upper and lower halves of the top slide, and it extends thence to the exterior.

The worm shaft is driven by appropriate mechanism, herein an electric motor 212 (see Fig. l), a reduction gear 214, and a change gear train 216, all of which are carried by the bottom slide 48. The motor is mounted on a motor stand 218 aflixed to the bottom slide 48, and the reduction gear 214 is built onto the motor as is common with such drives. The reduction gear has a shaft 280 to which is afiixed a change gear 282 (see Figs. 1 and 2) which is the first gear of the change speed train. In practice, the change speed train comprises a number of changeable gears by means of which various gear ratios may be obtained, but it is deemed unnecessary to show and to describe the entire gear set. It will suflice to state that one possible combination is shown and it comprises an idler gear 284 meshing with and driven by change gear 282 and in turn meshing with and driving a change gear 286, the latter being removably secured as by a screw 288 (see Fig. 11) and dowel pins 290 to a collar 292 commonly called a spud fixedly secured to the rear end of the worm shaft 260 as by a set screw 294. The change gear 282 is secured in like manner tothe reduction gear shaft 280, as shown in Fig. 1, in which the gear 286 is omitted and the collar 292 is partly broken away to show the gear 282 and its attachment to the shaft 280. Hence, the change gears 282 and 286 are interchangeable with each other.

Returning now to Fig. 3, to accommodate change gears 284 and 286 of different diameters,

there is provided a quadrant 296 pivoted on a stud 298 on a bracket 300, to which it may be secured in various angular positions by a bolt 302 extending through a segmental slot 304 and supported by the bracket 306, and this quadrant is provided with a slot 306 in Which a stud 308, carrying the gear 284 is radially adjustable with reference to the stud 298. No further description of the change gear set is deemed necessary to a proper understanding of the invention.

The general operation and mode of use will now be described, reference being had at first to Fig. l. The slide rest is universal, and may be employed for straight turning, for facing, and

for taper turning, that is to say, the setting of.

the swivel 66 may be anywhere from 0 to 90,

and this is accomplished by first loosening the binder screw II6 (Fig. 10), then swinging the swivel to the desired angle shown by the graduations I26 on the dial plate I22, and finally tight-q ening the binder screw. As shown in Fig. l, the swivel is set for a 30 taper. If facing is to be done from the center outwardly, the tool bit shank I47 should be removed and reversed from the position shown so that the tool bit I44 will:

occupy a position at the opposite side of the tool holder I40.

Next, the binding screws 90 for the bottom slide 48 should be loosened, and the knob 34 beneath the bed should also be loosened. Then, with;

the top slide I retracted to some-such position as that shown in Fig. l, and with the tool bit I44 set with its cutting edge I46 on a level with the axis of the work 28, the entire slide rest should be set in the proper working position. Then the knob 34 and the binding screws 90 should be tightened, and if necessary the cutting edge of the tool bit should be readjusted accurately to the level of the axis of the work by loosening the screw I 66, turning the tool.

bit shank I41, and then tightening the screw I66.

The stop screw 245 should be adjusted so that in the retracted position of the top slide I30, the cutting edge I46 of the tool bit I 44 will occupy a position somewhat to the right of the work 28,,

in practice about one eighth of ,an inch. The

travel of the tool bit should be determined by setting the stop nut 204 at the correct position on the locking pin I86 so that the latter will be withdrawn from its interlocking engagement with the tool holder I40 at the proper instant.

When all settings have been made, the tool bit I44 is dropped away from the horizontal plane containing the axis of the work, and the rack 208 is disengaged from the pinion 2I2 by. re-

tracting the locking pin I86. The motor 212 is When the tool bit I 44 nears the predetermined position, the stop nut 204 contacts the end plate 202, and after a further slight advance, the locking pin is withdrawn from its interlocking engagement with the tool holder I40, whereupon the springs 234 assert themselves to retract the rack 208 out of mesh with the pinion 2I2. The tool bit I44 drops away from the work under the influence of the springs 234, and the top slide, no longer driven by its driving mechanism, is

' compounded, i. e. by the substitution of a pair of returned by the return spring 240 and strikes the cushioning stop 243. Inasmuch as. the tool bit I44 has dropped away from the work, no mark is left on the latteriduring the retraction of the top slide I30. The work piece is then removed from the collet 26 and replaced by another one, after which, pressure on the handle I42 elevates the tool bit and starts a new cycle of operation.

A wide range of feed rates may be obtained by appropriate substitutions of change gears in the gear'set 216." If the feed gearing is to be compound gears secured together axially, more room is required for the gear set, and the motor 212 must be backed away the required distance by loosening four clamping'screws 3H1 extending through slots M2 in the motor base and threaded into the motor stand 218.:

Having thus described one embodiment, of the invention, but without limiting myself thereto, what I claim and desire, by Letters Patent, to

" secure is:

1..In a lathe, the combination of a bed, a tool holderga top slide which carries said tool holder, a swivel on which said top slide is'horizontally slidable, a bottom slide on which said swivel i s mounted for adjustment about a vertical axis, a base on which said bottom slide is horizontally slidable transversely of said bed, power-driven means for advancing said top slide "to move the tool along the work, means for tool carrier, a 1 carrier, aswivel on which said topslide is horizontally slidable, a bottom slide on which said .swivel is mounted for adjustment-{about a vertical axis, a base on which said 'bottom slide is horizontally slidable transversely of said bed, mechanism for causing advance of said top slide "to 'move the tool along the work during the 7 carrier, a top slide which carries said tool cara and restoring the same predetermined point in .for'causing retraction of said tool holder after and, including means for inof said top slide at a its advance, and means turning operation, terrupting the advance its advance has been interrupted- 3. In a lathe, the combination of a bed, a tool rier, a swivel on which said top slide is hori- -zontally slidable, a bottom slide on which said swivel is mounted for adjustment about a vertical axis, a'base on which said bottom slide is horizontally slidable transversely of said bed,

" mechanism for causing advance of said top slide to move said tool carrier along the work during the turning operation, and including means for interrupting theadvance of said top slide at a predetermined point in its advance, and means yieldingly resisting the advance of said top'slide to its starting position.

4. In a lathe, the combination of a bed, a top yieldingly resisting the advance of said top slide on which said top slide is horizontally slidable, a bottom slide on which said swivel is mounted for adjustment about a vertical axis, a base on which said bottom slide is horizontally slidable transversely of said bed, tool carrier advancing mechanism including means to interrupt the advance of said top slide at a predetermined point in its advance and to move said tool carrier transversely of and from the work, and means to cause retraction of said top slide in a direction opposite to its direction of advance. 7

5. In a lathe, the combination of a bed, a tool holder, a top slide which carries said tool carrier, a swivel on which said topslide is horizontally slidable, a bottom slide on which said swivel'is mounted for adjustment about a vertical axis, abase on which said bottom slide is horizontally slidable transversely of said bed, means for advancing saidtop slide, means for utilizing advance of-said top slide to stop its advance, and means for retracting said top slide.

6, In a lathe, the combination of a bed, a

tool holder, a top slide which carries said tool carrier, a swivel on which said top slide is horizontally slidable, a bottom slide on which'said :swivel is mounted for adjustment about a vertical axis, a base on which said bottom slide is horizontally slidable transversely of saidrbed,

means including a power-driven-member for advancing said top slide, means consequent'upon advance of said top slide to cause disconnection of said top slide from said power-driven member, and means consequent upon such disconnection to cause retraction of said top slide. 7

7. In a lathe, the combination of abed, a tool carrier, a top slide which carries said tool carrier, a swivel onwhich said slide is mounted, a bottom'slide on which said swivelis mounted for adjustment about a vertical'axis, tool carrier advancing mechanism for advancing said top slide relatively to said swivel, the same including means to interrupt the advance of said top slide at a Vance, and means forcausing retraction of said top slide after its advance has been interrupted. 8. Ina tool carrying mechanism for lathes, the combination of a toolholder, a top slide 'by which said tool holder carried; a swivel on which said slide is mounted to slide horizontally, a bottom slide on which said swivel is mounted for adjustment about a vertical axis, a base'on which said bottom slide is mounted for horizontal adjustment, mechanism carried partly by said. swivel and partly by said bottom slide for advancing said top slidehorizontally along said swivel, the last-mentioned mechanism including means to utilize the advance of said top slide to arrest its advance, andmeans yieldingly to resist said advance and to retract said top slide.

9. In a tool carrying mechanism for lathes, the combination of a tool holder, a horizontally slidable slide by which said tool holder is carried a swivel on which said slide is supported,

a support on which said swivel is mounted for adjustment about a vertical axis, a driving member supported by said support below and independently of said swivel, and mechanism operated by said driving member to impart ,a horizontal movement to said slide, saidmechanism including means to interrupt said horizontal movement at a predetermined point in such movement, and means to impart a horizontal movement to said slide in the opposite direction. 10. In a tool carrying mechanism for lathes,

the combination of a tool holder, a horizontally slidable slide by which said tool holder is carried, a swivel'on which said slide is supported, a support on which said swivel is mounted for adjustment about a vertical axis, a driving member supported by said support below and independently of said swivel, and mechanism operated by predetermined point in its adsaid driving member to impart a horizontal movement to said slide, said mechanism including means to utilize said horizontal movement to disconnect said slide from said. driving member, and means to impart a horizontal move ment to said slide in the opposite direction.

11. In a too-l carrying mechanism for lathes, the combination of a tool holder, a horizontally slidable slide by which said tool holder is carried, a swivel on which said slide is supported, a support on which said swivel is mounted for ad justment about a vertical axis, a driving member supported by said support, and mechanism operated by said driving member to impart a horizontal movement to said slide, said mechanism including a horizontal shaft supported by said support, a vertical shaft rotatable about said vertical axis, a disconnectible driving connection between said vertical shaft and said slide, and means to cause a disconnection in said driving connection.

12. In a tool carrying mechanism for lathes, the combination of a tool holder, a horizontally slidable slide by which said tool holder is carried, a swivel on which said slide is supported, a support on which said swivel is mounted for adjustment about a vertical axis, a driving member supported by said support, and mechanism operated by said driving member to impart a horizontal movement to said slide, said mechanism including a horizontal shaft supported by said support, a vertical shaft rotatable about said vertical axis, a disconnectable driving connection between said vertical shaft and said slide, and means consequent upon horizontal movement of said slide to cause a disconnection in said driving connection.

13. In a tool carrying mechanism for lathes, the combination of a tool holder, a slide on which said tool holder is mounted to rock about a horizontal axis extending lengthwise of the direction of movement of said slide, a swivel on which said slide is mounted to slide horizontally, a support on which said swivel is mounted for adjustment about a vertical axis, a driving member supported by said support, and mechanism operated by said driving member to impart a horizontal movement to said slide, said mechanism including means to interrupt the driving connection between said slide and said driving member and to rock said tool holder about said horizontal axis to carry the tool from the work.

14. In a tool carrying mechanism for lathes, the combination of a tool holder, a rockshaft to which said tool holder is secured, a slide on which said rockshaft is mounted to rock about a horizontal axis extending lengthwise of the direction of movement of said slide, a swivel on which said slide is mounted to slide horizontally, a support on which said swivel is mounted for adjustment about a vertical axis, a horizontal shaft supported by said support, a vertical shaft mounted to rotate about said vertical axis and driven by said horizontal shaft, a pinion secured to said vertical shaft, a rack meshing with said pinion and transmitting motion to said slide to slide the latter horizontally, a rack dog secured to saidrockshaft and maintaining said rack in mesh with said pinion, a locking pin carried by said slide, normally interlocked with said tool holder and preventing rocking of said rockshaft, a spring which moves said rack out of mesh with said pinion and rocks said rockshaft and swings said tool holder vertically when said locking pin is withdrawn from its interlocking engagement with said tool holder, and a locking pin stop which limits the advance of said locking pin and withdraws the latter from its interlocking engagement with said tool holder when said slide reaches a predetermined point in its travel under the influence of said rack.

15. In a tool carrying mechanism for lathes, the combination of a tool holder, at rockshaft to which said tool holder is secured, a slide on which said rockshaft is mounted to rock about a horizontal axis extending lengthwise of the direction of movement of saidslide, a swivel on which said slide is mounted to slide horizontally, a support on which said swivel is mounted for adjustment about a vertical axis, a horizontal shaft supported by said support, a vertical shaft mounted to rotate about said vertical axis and driven by said horizontal shaft, a pinion se cured to said vertical shaft, a rack meshing with said pinion and transmitting motion to said slide to slide the latter horizontally, two pins attached to said rack, twoguides for said pins, respectively, a rack dog secured to said rockshaft and having an elongated face engaging and maintaining said rack in mesh with said pinion, a locking pin carried by said slide, normally interlocked with said tool holder and preventing rocking of said rockshaft, two springs which cause a parallel movement of said rack out of mesh with said pinion and act through said rack dog to rock said rockshaft and to swing said tool holder vertically when said locking pin is withdrawn from its interlocking engagement with said tool holder, and a locking pin stop which limits advance of said locking pin and withdraws the latter from its interlocking engagement with said tool holder when said slide reaches a predetermined point in its travel under the influence of said rack.

16. In a tool carrying mechanism for lathes, the combination of a tool holder, a rockshaft to which said tool holder is secured, a slide on which said rockshaft is mounted to rock about a horizontal axis extending lengthwise of the direction of movement of said slide, a swivel on which said slide is mounted to slide horizontally, a support on which said swivel is mounted for adjustment about a vertical axis, a horizontal shaft supported by said support, a vertical shaft mounted to rotate about said vertical axis and driven by said horizontal shaft, a pinion secured to said vertical shaft, a rack meshing with said pinion and transmitting motion to said slide to slide the latter horizontally, a rack dog secured to said rockshaft and maintaining said rack in mesh with said pinion, a locking pin carried by said slide, normally interlocked with said tool holder and preventing rocking of said rockshaft, a locking pin spring which tends to maintain interlocking engagement of said locking pin with said tool holder, two springs which cause a parallel movement of said rack out of mesh with said pinion and act through said rack dog to rock said rockshaft and to swing said tool holder vertically when said locking pin is withdrawn from its interlocking engagement with said tool holder, and a locking pin stop which limits the advance of said locking pin and withdraws the latter from its interlocking engagement with said tool holder when said slide reaches a predetermined point in its travel under the influence of said rack. v

17. In a lathe, the combination of a bed, a headstock having a work rotating spindle, a base secured to said bed, a bottom slide mounted on said base to slide horizontally, transversely of said bed, a swivel mounted on said slide for adjustment .about a vertical axis, a top slide mounted on said swivel to slide horizontally, a

*rockshaft mounted on said top slide to rock about a horizontal axis, a tool holder secured to said rockshaft, a tool bit held by said tool holder and having a cutting point normally in a hori- -zontal plane containing the axis of said spindle, 10a horizontally slidable tool holder locking pin slidably mounted on said top slide and normally interlocked with said too-1 holder to maintain said cutting point in said plane, a locking pin retaining spring tending to retain said locking pin interlocked with said tool holder, mechanism to cause advance of said top slide with relation to said swivel, said mechanism including a horizontal shaft mounted on said bottom slide, a vertical shaft rotatable about said vertical axis, a worm on said horizontal shaft, a worm gear on said vertical shaft and meshing with and driven by said worm, a. spur pinion on said vertical 'shaft, a rack meshing with said pinion and ,transmitting motion to said top slide to slide the latter horizontally, guide pins on which said rack is mounted for movement into and out of mesh with said pinion, a rack dog secured to said rockshaft and maintaining said rack in mesh with said pinion when said locking pin is interlocked with said tool holder, springs which move said rack out of mesh with said pinion and which act through said rack dog, said rockshaft and said tool holder to carry said tool bit down- -wardly from said plane when said locking pin is withdrawn from interlocking engagement with said too-1 holder, an adjustable locking pin stop carried by said locking pin and cooperating with said top slide to limit advance of said locking pin as said top slide advances and to withdraw said'locking pin from its interlocking engagement with said tool holder when said top slide reaches a predetermined point in its advance,

thereby permitting said rack to bemoved out of mesh with said pinion and said tool bit to be 4.5 lowered from said plane, atop slide retracting spring which retracts said top slide when said rack is carried out. of mesh with said pinion, and an adjustable stop carried by said swivel and which limits retraction of said top slide. under the influence of said retracting spring.

18. In a tool carrying mechanism for lathes, the combination of a' motor, a bottom slide on which said motor is mounted, a base on which said slide is mounted to slide horizontally, a swivel mounted on said slide for adjustment about a vertical axis, a top slide mounted on said swivel to slide horizontally, a tool holder carried by said top slide, and driving mechanism to transmit power from said motor to said top 0 slide regardless of the angular relationship between said swivel and said bottom slide.

19. In a tool carrying mechanismior lathes, the combination of a motor, a bottom slide on which said motor is mounted, a base on which 5 said slide is mounted for horizontal adjustment,

means to adjust said slide horizontally with relation to said base, a swivel mounted on said slide for adjustment'ab'out a vertical axis, means to fix said swivel in the desired position of'adjustm'ent, a top slide mountedon'said swivel to slide horizontally, a tool carrier carried by said "top slide, and driving mechanism to transmit power from said motor to said top slide to slide the latter horizontally independently of said adjustments. 7 1

2,oes,933

20. In a tool carrying mechanism for lathes,

the combination of a motor, a bottom slide on which said motor is mounted, a base on which said slide'ismounted for horizontal adjustment, a swivel mounted on saidslide for adjustment about a vertical axis, a top slide mounted on said swivel to slide horizontally, a tool holder carried by said top slide, and driving mechanismto transmit power from said motor to said top slide to feed the latter horizontally, said driving mechanism including a change gear set .to change the rate of feed of said top slide.

21. In a tool carrying mechanism for lathes, the combination of a motor, a bottom slide on which said motor is mounted, a base onwhich said slide is mounted for horizontal adjustment, a swivel mounted on said slide for adjustment about a vertical axis, a top slide mounted on said swivel to slide horizontally, a tool holder carried by said top. slide, and driving mechanism to transmit power from said motor to said top slide to feed the latter horizontally, said driving mechanism including a change gear' set to change the rate of feed of said topslide, said change gear set being mounted on said bottom slide.

22. In a'tool carrying mechanism for lathes,

the combination of a motor, a bottom slide on which said motor is mounted for horizontal adjustment, a base on which said slide is mounted for horizontal adjustment, a swivel -mounted on:

said slide for adjustment about a vertical axis, atop slide mounted on said swivel to slide horizontally, a tool carrier carried by said top slide;

and driving mechanism to transmit power from said motor to said top slide to feed the latter horizontally regardless of the settings of said adjustments, said driving mechanism including a shaft carried by said bottom slide, anda change gear set connecting said motor and said shaft to enable the rate of feed of said top slide to be changed, said gear set being mounted on said bottom slide between said motor and said shaft, the horizontal adjustment of said motor being toward and from said shaft to provide more or less room for said gear set to accommodate different combinations of gears in said gear set. V

'23. In a lathe, the combination of a tool carrier, a horizontally movable top slide which carries said tool carrier, a swivel which carries said slide, a bottom slide on which said swivel is mounted and is adjustable about a vertical axis, a bed on which said bottom slide is mounted to slide transversely of said bed, a motor supported by said bottom slide, and driving mechanism to transmit power from said motor to said slide to feed the latter horizontally regardless of 'the adjustment of said swivel about said axis.

24. In a lathe, the combination of a' tool carrier, a horizontally movable top slide which carries said tool carrier, a swivel which carries said slide,- a bottom slide on which said swivel is mounted and is adjustable about a vertical axis,

a bed on which said bottom slide is mounted to slide transversely of said bed, a motor supported by said bottom slide, and driving mechanism to transmit power from said motor to said slide to feed the latter horizontally regardless of the adjustment of said swivel about said axis, said driving mechanism including a change gear set to change the rate of feed of said slide, said change gear set being supported by said bottom slide.

.FREDERICKC. BLANCHARD.

CERTIFICATE OF CORRECTION.

Patent No. 2,065,933. December 29, 1936.

FREDERICK C. BLANCHARD.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 4, first column, line 51, claim 2, for the words "tool holder" read top slide; lines 67 and 68, claim 4, for "a top yieldingly resisting the advance of said top slide" read a tool' carrier, a top slide which carries/said tool carrier, a swivel; line '73, same claim, for "tool carrier" read a' top slide; and second column, line 33-34, claim '7, for "tool carrier"read top slide; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 2nd day of March, A. D. 1937.

I Henry Van Arsdale (Seal) Acting Commissioner of Patents. 

